Push button lock



FIG. 1 is a perspective view of a push button lock showing our new design;

FIG. 2 is front view of the push button lock of FIG. 1;

FIG. 3 is a rear view of the push button lock of FIG. 1;

FIG. 4 is a right side view of the push button lock of FIG. 1;

FIG. 5 is a left side view of the push button lock of FIG. 1;

FIG. 6 is a top view of the push button lock of FIG. 1; and,

FIG. 7 is a bottom view of the push button lock of FIG. 1.

The broken lines illustrate unclaimed portions and form no part of the claimed design. 

CLAIM The ornamental design for a push button lock, as shown and described. 